This is a beautiful apartment in an older building right in the heart of Bangkok's red light district. There are many colorful characters from all over the world who stay here. There is a 7-Eleven across the street, California Tattoo, and street food always available at all hours on Soi 4. Walk to the Nana metro takes about 7-12 minutes, depending on the time of day.
If you do not like the hustle and bustle of Soi 4 or walking through it, you can take a side street Soi 6 and cut over to Soi 4 to avoid the crowds. Although there is a massage shop (Kenica Massage), conveniently right across from the Omni, I do not recommend it. The masseuse cut her time short and the massage chair kept flopping about during the entire time.
The security/receptionist, Kan, is wonderful and speaks English very well. The Omni's security supervisor can provide transport from the Omni to the airport in a very comfortable and nice vehicle for 500 baht ($14-15).